Beside the distortion in the DNA backbone caused by a mismatched base pair, what additional mark is there on eukaryotic DNA to indicate which strand needs to be repaired?
(a) a nick in the template strand
(b) a chemical modification of the new strand
(c) a nick in the new strand
(d) a sequence gap in the new strand
(c)
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What technique can be used to detect genetic defects in early stage embryos, prior to implantation?
a. genetic screening b. chorionic villus sampling c. PGD d. amniocentesis e. micromanipulation
Flagella occur in both prokaryotes and eukaryotes. Which of the following statements DOES NOT describe how the flagella of prokaryotes and eukaryotes differ?
A. Eukaryotic flagella have microtubules in a cytoskeleton whereas prokaryotic ones do not. B. Eukaryotic flagella have the motor protein dynein whereas the prokaryotic one does not. C. The eukaryotic flagellum is covered by the plasma membrane whereas that of the prokaryotes is not. D. Prokaryotic flagella have a basal apparatus and hook that rotates the filament whereas eukaryotic flagella do not. E. The filament of eukaryotes is multilayered whereas that of prokaryotes is a single strand.
How would you best explain the existence of a mountain range that has abundant conifer trees, ferns, and mosses on the east side, but only sparse shrubby plants on the west side?
A. Adiabatic cooling leads to temperature gradients that produce the differing plant communities. B. Differences in solar intensity produce the differing plant communities. C. Precipitation differences due to a rain shadow on the west side produce the differing plant communities. D. Differences in the specific heat of the two sides of the mountain produce the differing plant communities.
Which of the following terms is least related to the others?
A) pedigree B) karyotype C) amniocentesis D) chorionic villus sampling E) epistasis